Make new Harmony constructors subclassing-friendly

src/arraybuffer.js

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 14 matching lines @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 "use strict";
 
 var $ArrayBuffer = global.ArrayBuffer;
 
 // -------------------------------------------------------------------
 
 function ArrayBufferConstructor(length) { // length = 1
-  if (%_IsConstructCall()) {
-    var byteLength = ToPositiveInteger(length, 'invalid_array_buffer_length');
-    %ArrayBufferInitialize(this, byteLength);
-  } else {
-    throw MakeTypeError('constructor_not_function', ["ArrayBuffer"]);
-  }
+  var byteLength = ToPositiveInteger(length, 'invalid_array_buffer_length');
+  %ArrayBufferInitialize(this, byteLength);
 }
 
 function ArrayBufferGetByteLength() {
   if (!IS_ARRAYBUFFER(this)) {
     throw MakeTypeError('incompatible_method_receiver',
                         ['ArrayBuffer.prototype.byteLength', this]);
   }
   return %ArrayBufferGetByteLength(this);
 }
 
@@ skipping 43 matching lines @@
   InstallGetter($ArrayBuffer.prototype, "byteLength", ArrayBufferGetByteLength);
 
   InstallFunctions($ArrayBuffer.prototype, DONT_ENUM, $Array(
       "slice", ArrayBufferSlice
   ));
 }
 
 SetUpArrayBuffer();